books.google.com - Available for the first time in paperback, R. Tyrrell Rockafellar's classic study presents readers with a coherent branch of nonlinear mathematical analysis that is especially suited to the study of optimization problems. Rockafellar's theory differs from classical analysis in that differentiability...https://books.google.com/books/about/Convex_Analysis.html?id=1TiOka9bx3sC&utm_source=gb-gplus-shareConvex Analysis